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This study quantifies how temperature, loading, and fiber direction affect carbon-fiber-reinforced plastic (CFRP) dynamics. Understanding these factors is crucial for predicting CFRP structural behavior under varying conditions.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Dynamics

Background:

  • Dynamic properties of carbon-fiber-reinforced plastic (CFRP) are vital for structural integrity.
  • Modal parameters, derived from frequency response functions (FRFs), are key to estimating these properties.
  • CFRP modal parameters are known to be sensitive to environmental and operational conditions.

Purpose of the Study:

  • To investigate the influence of temperature, spectral loading patterns, and carbon fiber direction on CFRP dynamic properties.
  • To develop a sensitivity index formulation based on parameter-dependent FRFs.
  • To explore the dynamic sensitivity of CFRP structures under varying conditions.

Main Methods:

  • Calculated modal parameters using frequency response functions (FRFs).
  • Derived a sensitivity index formulation from parameter-dependent FRFs.
  • Conducted uniaxial excitation tests on CFRP specimens across a temperature range (-8 to 105 °C) under harmonic and random loading.

Main Results:

  • Quantified the impact of temperature, spectral loading, and carbon fiber direction on CFRP modal parameters.
  • Established a sensitivity index to measure the influence of these parameters on CFRP dynamics.
  • Observed variations in acceleration response based on specimen direction and test conditions.

Conclusions:

  • Temperature, spectral loading, and carbon fiber direction significantly influence CFRP dynamic characteristics.
  • The developed sensitivity index provides a valuable tool for assessing CFRP structural behavior.
  • Findings are critical for accurate prediction and design of CFRP components in diverse applications.